Nothing to worry about - common with large capacity 'thumpers' and twins.
Its the ignition of excess unburnt fuel introduced when doing what you describe (and sometimes made worse by an air leak into the exhaust system - like if you had the system apart then didn't seal it properly)
My BMW R1150GS was a bugger for it - scared the bejeesus out of many a blue rinse waiting at the bus stop.
Found one to watch with this bike though. The engine breather exits into the bottom of the air box. After a big off and the bike being upside down - then going down a steep hill, my bike began popping and farting all over the place. I later discovered the engine had spat some oil out of the breather into the bottom of the airbox and this must have then been pulled / poured through the carb when going downhill causing the popping and banging. Worth checking if ever you have a big off.
When an investigation has been concluded it would be useful to post the contributory reasons to the accident so that other Clerks of Course can avoid the cause as far as possible. Lets do our upmost to prevent anything like this happening again in the future
What utter patronising garbage. How do you avoid / prevent a rider having an off riding trials?
If it had been my kid, the hardest job for the clerk of the course would be removing the renthals from around the offenders neck and the ohlins from where the sun don't shine.
I have had an evo 300 4T for 18 months and I can't understand the lack of power comments?
The damn thing will pull your arms off if you wind it on and I have been up some of the steepest and biggest climbs without any fuss - so much so that it was outdoing 250 2T who were full on using fourth gear. It has more power / torque than any clubman could EVER use.
You say that you have done the headstock? Have another look - raise front wheels off floor and grab bottom of front fork legs - rock backwards and forwards looking for play. Be careful of sliding fork movement which can mask small amounts of play in the bearings (which is my logic for thinking you may have missed this in your first check)
Even a minute amount of play in the head bearing will cause a knock. Could also be your brake caliper loose.
My 09 evo 4T has just gone the same way. First heard it squeking every wheel revolution then on a long lap it must have built up so much heat that the fluid expanded and siezed the brake on.
I have previously noted that the evo brake discs are fixed as opposed to the floating discs on the previous rev3. It was always going to be a backward step on a trials bike (with the degree of abuse and potential for the wheel / disc to be out of true) and I can't work out the logic of it?
Stand the bike upright with the rear wheel upright and against the post and then secure it with a strap to the post. Use a strap from the right handlebar (near the bend) to the rack post to the right of the back wheel - and a further strap from the left handlebar to the towbar loop (on the rack socket)
new evo 4t help
in Beta
Posted
see here.....
http://www.trialscentral.com/forums/topic/23670-beta-evo-4t-250300/page__hl__evo4t__st__30
Nothing to worry about - common with large capacity 'thumpers' and twins.
Its the ignition of excess unburnt fuel introduced when doing what you describe (and sometimes made worse by an air leak into the exhaust system - like if you had the system apart then didn't seal it properly)
My BMW R1150GS was a bugger for it - scared the bejeesus out of many a blue rinse waiting at the bus stop.
Found one to watch with this bike though. The engine breather exits into the bottom of the air box. After a big off and the bike being upside down - then going down a steep hill, my bike began popping and farting all over the place. I later discovered the engine had spat some oil out of the breather into the bottom of the airbox and this must have then been pulled / poured through the carb when going downhill causing the popping and banging. Worth checking if ever you have a big off.